Improve strutils.rsplit doc, proc and iterator have oppose result order. (#23570)

[`rsplit
iterator`](https://nim-lang.org/docs/strutils.html#rsplit.i,string,char,int)
yields substring in reversed order,

while [`proc
rsplit`](https://nim-lang.org/docs/strutils.html#rsplit%2Cstring%2Cchar%2Cint)'s
order is not reversed, but its doc only declare ```
The same as the rsplit iterator, but is a func that returns a sequence
of substrings.
```

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